Line Current Calculator
Calculate line current in single-phase and three-phase circuits instantly. Input voltage, power, and power factor to determine accurate current values.
Line Current Calculator:
Line current is the current that passes through each of the conductors of a given electrical system. The Line Current A calculator is used to quickly calculate current in single-phase or three-phase circuits in terms of voltage, power, and power factor. Enter the values, and it provides accurate amperage when used to analyze loads, size a conductor, and also to select a protective device.
Line Current Tools formula
The Line Current Calculator computes the current flowing in single-phase or three-phase electrical circuits based on voltage, power, and power factor. For single-phase circuits, it uses the formula:
\[ I = \frac{P}{V \times PF} \]
For three-phase circuits, it uses:
\[ I = \frac{P}{\sqrt{3} \times V \times P} \]
where I is the line current in amperes (A), P is the power in watts (W), V is the line voltage (V), and PF is the power factor.
This calculator is ideal for electrical engineers, electricians, and students to size conductors, select protective devices, and analyze load currents. Simply input the voltage, total power, and power factor to instantly obtain line current values. The tool works for both AC and DC circuits, helping ensure electrical systems are safe and properly designed.
Work & Installation — Input to Output Summary
Work:
- Calculates line current in AC and DC circuits.
- Supports single-phase and three-phase systems.
- Useful for conductor sizing, load analysis, and protective device selection.
Installation:
- Add HTML input fields for voltage (V), power (P), and power factor (PF).
- Include JavaScript formulas:
Single-phase: I = P / (V × PF)
Three-phase: I = P / (√3 × V × PF) - Display output in amperes (A).
Input:
- Total Power (P, W)
- Voltage (V, volts)
- Power Factor (PF, decimal or percentage)
- Circuit Type: Single-phase / Three-phase
- Line Current (I, A)
Testing and Final Adjustments
Check against known cases: single-phase 230 V, 2300 W, PF = 0.8 I = 12.5 A; three-phase 400 V, 10 kW, PF = 0.9 I = 16.0 A. Be sure of proper handling of units and PF input (percentage or decimal). Add input-checking to exclude the input of zero or negative voltages/power. Test on desktop and mobile responsive display. Optional: provide real-time dynamic updates of values. After validation, complete UI, rounded off precision, and a mobile-friendly design to be professionally and academically useful.
Frequently Asked Questions - Line Current Calculator:
What is line current?
Line current is the current flowing through each conductor in a single-phase or three-phase electrical system.
How do you calculate line current in single-phase?
I = P / (V × PF), where P is power, V is voltage, and PF is power factor.
How do you calculate line current in three-phase?
I = P / (√3 × V × PF), where P is power, V is line voltage, and PF is power factor.
What units are used for line current?
Line current is measured in amperes (A).
What is power factor?
Power factor is the ratio of real power to apparent power in an AC circuit.
Can this calculator be used for DC circuits?
Yes, for DC circuits PF = 1 and the formula reduces to I = P / V.
Why is line current important?
It is used for conductor sizing, protective device selection, and load analysis.
What if the voltage is too low?
The line current will increase, which may overload the circuit if not properly sized.
Is this calculator suitable for industrial loads?
Yes, it works for residential, commercial, and industrial AC/DC circuits.
Can it calculate three-phase currents for different voltages?
Yes, enter the line voltage and power factor to get accurate line current.
